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vol.21 issue2EFFECTS OF ACETYLSALICYLIC ACID ON ETHANOL-INDUCED INTRAUTERINE GROWTH RESTRICTION IN RATS author indexsubject indexarticles search
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International Journal of Morphology

On-line version ISSN 0717-9502

Abstract

SOARES DA SILVA ARAUJO, Cristiane et al. BONE DEVELOPMENT OF BROILER CHICKENS FED DIETS WITH DIFFERENT  AMINO ACID AND CALCIUM LEVELS DURING THE STARTER PHASE. Int. J. Morphol. [online]. 2003, vol.21, n.2, pp.101-106. ISSN 0717-9502.  http://dx.doi.org/10.4067/S0717-95022003000200001.

Two experiments were conducted in order to evaluate the effects of different dietary amino acid and calcium profiles on the bone characteristics of two chicken strains (Avian Farms and Cobb) during the starter phase. At the end of each experiment, 2 chickens of each replicate were sacrificed and their tibiae were collected for analysis of following bone characteristics: bone measurements (weight, length and thickness of the compact and spongy layers) and bone density (bone densitometry). A total of 540 birds were used in each experiment, divided into fully randomized blocks with a 3 x 2 factorial schemes, i. e., 3 amino acid profiles (methionine, lysine and threonine ­ 100%, 125% and 150% of NRC recommendations, 1994) and 2 calcium levels (75% and 100% of NRC recommendations, 1994), with 30 birds per replicate. Birds of the Cobb strains fed 75% of the recommended calcium allowance showed lower bone density. Calcium level significantly affected the weight and thickness of the spongy layer of the tibia. In birds of the Avian strain, bone density and measurements were not affected by any of the experimental treatments

Keywords : Amino acid; Bone density; Broiler chickens; Calcium.

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